load

# File activesupport/lib/active_support/messages/serializer_with_fallback.rb, line 17
      def load(dumped)
        format = detect_format(dumped)

        if format == self.format
          _load(dumped)
        elsif format && fallback?(format)
          payload = { serializer: SERIALIZERS.key(self), fallback: format, serialized: dumped }
          ActiveSupport::Notifications.instrument("message_serializer_fallback.active_support", payload) do
            payload[:deserialized] = SERIALIZERS[format]._load(dumped)
          end
        else
          raise "Unsupported serialization format"
        end
      end